Apparatus for controlling the temperature of fluids



May 23, 1939. c. DANUSER ET Al.

`APPARATUS FOR CONTROLLING THE TEMPERATURE 0F FLUIDS Filed Aug. 2l, 1935 3 Sheets-Sheet l Fig. 1

c. DANUSER Er AL 2,159,257

- APPARATUS FOR CONTROLLING THE TEMPERATURE OF FLUIDS May 23, 1939.

3 Sheets-Sheet 2 Filed Aug. 2l, 1935 May23, 1939- c. DANUSER Er AL `2,159,257

APPARATUS FOR CONTROLLING THE TEMPERATURE F FLUIDS Filed Aug. 2l, 1935 3 Sheets-Sheet I5 Fig. .9 Fig. 70

NAM

Patented 'Maly 23, 1939 APPARATUS FOR CONTROLLING THE TEMPERATURE OF FLUIDS Caflisch Danuser, Zurich, and Felix Danuser, Kreuzlingen, Switzerland Application August 21, 1935, Serial No. 37,250 In Switzerland August 29, 1934 1 Claim. (Cl. 15S-.28)

The invention relates to improvements in heating devices especially adapted for heating the cooling water in internal combustion engines and the like to prevent freezing and to facilitate starting of the engine.

The main object of the invention is to provide an apparatus adapted to be mounted as a fixed equipment on any motor car etc. The improved heating device, although very small in size, has

m a very high heating capacity which moreover may be varied according to requirements. The new device needs a minimum of attendance as the liquid fuel is automatically supplied from a large storage tank separated from the heating appam ratus itself. l

Another object of the invention is to provide means to automatically clean the nozzle of the burner to prevent a clogging of the fuel supply.

Still another object of the invention is to provide positively operated means to stop the supply of fuel if the ignition of the fuel fails.

The various features of novelty which characterize our invention are pointed out with particularity in the claim annexed to and forming part of this specification; but for a better understanding of the invention, however, its advantages and specific objects attained with its use, reference should be had to the accompanying drawings and descriptive matter in which we have illustrated 3G and described preferred embodiments of our invention.

In the drawings:

Fig. l shows the connection of the apparatus and parts thereof in a diagrammatical manner.

Fig. 2 is a sectional elevation of the heat exchanger.

Fig. 3 is an enlarged detail vertical section of the nozzle cleaner.

Figs. 4 to 6 are sections on the lines IVIV,

to V-V, VI-VI of Fig. 2, respectively.

Figs. 7 and 8 are sections taken on lines VII-VII and VIII-VIII of Fig. 6 respectively.

Fig. 9 shows in side elevation the assembled parts of the apparatus, viz. the heat exchanger,

the relays, the ignition device, the fuel pump,

etc.

Fig. 10 illustrates the same parts as Fig. 9, but in front elevation. A

Fig. 11 is a detail View hereinafter referred to.

In Fig. 1 of the drawings is shown diagrammatically the layout of the apparatus including the electrical circuits. In this Figure E indicates ground, i. e. the frame of the vehicle or the engine; B indicates the usual storage battery, and

S the usual ignition switch; S indicates a switch for turning on and off the water heating apparatus which constitutes the principal part Aof the present invention.

'I represents a thermostat which is located Within the sphere of inuence of the water to be heated. It may comprise a mercury thermometer which is provided with two contact pins g and e located at certain distances apart, and a constant connection from the mercury in the bulb to a circuit wire a from switch S. Switch S is electrically connected to the ungrounded terminal of the battery B, preferably through a thermostaticy switch or cut-off, hereinafter again re- 'I'he switch S' is connected with the ungrounded terminal of the battery and with the usual wire d leading to the ignition circuit of the engine, and with a wire b which leads to contact pin e and to the electro-magnet III of a circuit opener and closer (relay) having normally closed contacts h which are adapted to be opened when electro-magnet III becomes energized, as will be later explained. The electromagnet III has its other terminal grounded, as

A second circuit opener and closer (relay) is provided whose electro-magnet II has a terminal grounded at E and its other terminal connected by wire i to the fixed one of contacts h.

The heating coil H of the water heater l, hereinaiter specifically described, and a signal lamp L in parallel therewith, have one common terminal grounded at E through a bi-metallic circuit opener p (thermally controlled), while the other common terminal is connected with wire i.

R designates the fuel nozzle cleaning device, also laterspeciflcally described, and I is the electro-magnet of a third circuit opener and closer (relay) having normally closed contacts lc, which electro-magnet is connected in parallel with the cleaning device R. One common terminal of the members R and I is grounded at E through a bimetallic (thermally controlled) circuit opener 7L.

The fuel pump is designated by the reference letter P in Fig. 1, and it has one terminal of its operating coil grounded at E, while the other terminal thereof connects to the fixed one of the Z designates the primary coil of an ignition device for producing a spark at Z to ignite the fuel for the burner of the heater hereinafter more fully described. The coil Z has one terminal connected to the fixed one of the contacts k, while its other terminal is grounded through a bi-metallic (thermally controlled) circuit The heating .device for the cooling -iwater of the motor comprises a burner adapted for fuel.

preferably a hydro-carbon, such as petrol, ben'- -extinction of the flame of the burner.

A preferred embodiment of our invention is shown in the Figures 3 to 10.

The device comprises a boiler I having a water inlet 2 and a water outlet 3. In a combustion chamber 4 within the shell of the boiler I a fuel burner 5 is arranged. The fuel is fed by the pump P through a pipe to the annular groove 1. There the said-fuel evaporates and the vapor flows through pipes 8, 3', nozzle 9 and outlet III to the head II of the burner. The' vapor mixed with air escapes through apertures I3 and is ignited in a manner hereinafter set forth. The hot gases thereby produced are distributed by a cover I4 and ow upwards through pipes I5,

thereby heating the surrounding walls and therewith the water in the boiler. The hot gases leave the heat exchanger or boiler I through apertures rality of felt or metal discs, im arts to the fuell a constant velocity and preven the intermittent feeding of the fuel by the pump from influencing the steady ilame of the burner. At 6 between choke and burner the pipe 6 is hellcally wound so as to obviate the back-firing of the burner to the fuel container, as the evaporated fuel will be sufficiently cooled in said coil 6 of pipe 6.

23 is a strainer disposed between nozzle 9 and outlet I0, its purpose being to keep back any impurity from said nozzle 3. Fresh air is supplied to the burner 5 through openings 24 in the -outer wall` of the heat exchanger, said openings being similarly covered by a strainer or the like.

The bi-metal contact p is xed to one of the supports 2|, whereas the other bi-metallic strip n is disposed between the two other supports 2l. 'I'he last mentioned bi-metal contact n is arranged very near the heat source H. Secured to the edge of the cover I4 is a further bi-metal strip 28 bearing at one end an adjusting nut 29 bearing always against head II of the burner and pressing the same downwardly. When set in operation theburner becomes hot and strip 25 therefore presses the head II more firmly on its base so as to prevent any rattling when the vehicle is movlng. The heating resistancewire His clamped to the annular channel 1 by nuts and screws 30.

A spark to ignite the vapors escaping is produced between head II and a rod 3I xed to a tube32 of insulating material, said tube 32 being secured to base plate 2li by clamping means 33. Plate 20 is secured to a mounting plate 34 to which also pump P, ignition device Z and` relays I, 11 III, enclosed in a casing K, are fastened. A protecting cap may be provided for apparatus Z and casing K. The wall of the heat exchanger "I is provided at its lowery end with ilanges extending below the clamping ring 35 -iixed to plate 20. By slightly turning the screws 36, heat exchanger I may be rotated about its axis accord-ingl to the' 1 direction from whichthe water inlet pipes come.

I Assume that the cooling water of the engine and radiator is below 20 degrees centigrade. The operator, before turning on the switch S (which controls the ignition circuit to the spark plugs of the engine), closes the switch S. Current from battery B, upon closing of switch S, then ows through wire a, contacts h, wirel l, contacts k, pump P, ignition coil Z, heater H, vlamp L,y fuel nozzle cleaner R, and coils I and II. Since coil I is at once energized, the circuit is immediately opened at contacts Ic and the current flows te pump P and spark coil Z is interrupted before any substantial operation of eitherl P or Z takes place; also coil II opens the contacts l to open sub-circuit a, f; e, b at that point. As soon as the heating resistance IH has; attained the required preheating temperature to evaporate the fuel, the bi-xnetallic contact n opens the circuit of the nozzle cleaner R and the relay coil I. which permits contacts k to close again and current to flow through the pump circuit and through to rise. Asthe temperature rises the mercury inv thermostat T will-reach contact pin g, but no current will iiow because the sub-circuit is still open at f (magnet II being still energized).

If at this point the operator wishes to start his car, he closes switch S', which immediately causes an energization of the electro-magnet III and opens the circuit at h, thereby stopping pump P and allowing burner flame to go out. lIf, however, the operator is not yet desirous` of starting his car, the heating of the water continues until a temperature of 35 degrees C. is reached, whereupon the mercury inthe thermostat Twill have reached contact pin e and current will now flow from b to c and through magnet III to open the circuit at h which stops the pump P, de-energizes coil II and permits the burner flame to become extinguished, thus stoppingy the operation of the apparatus.

As coil II is de-energized, the circuit at f is closed. This produces no effect at the time except to prevent the circuit through the magnet III from opening until the mercury has fallen Ibelow contact pin g (at 20v degrees C.), when overheating, for instance if there is no water left either in the motor, viz. in the cylinder jackets of the motor or in the boiler of the heating device. Thus said boilerl ls protected from overheating.

Preferably, a closed container or chamber is inserted in the inlet pipe of pumpP as a protec- 5 inlet pipe opens at thetop of the said closed container, whereas the outlet pipe is designed as an immersion pipe.

Instead of a relay I, a bi-metal switch might be used. Ot course the spark ignition device may 10 be substituted by a glowing resistance coil of any known construction. The bi-metal contacts are preferably held -under tension. In many cases a catalytic heating device might be preferable to the heating device above described,

As many changes could be made in the above construction, and many apparently widely di!- ferent embodiments of this invention could be made without departing from the scope thereof. it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

'Ihis application is a continuation in part oi' the application illed March 1, 1933, on which s Patent N0. 2,074,168 was issued March 18, 1937.

Having thus described our invention, what we claimasnewanddesiretosecin'ebynetters Patent is:

An apparatus for controlling the temperature of water comprising, in combination a water heater that includes an electrically controlled burner, said burner including a nozzle having a tapering passage from its inlet end to adjacent its outlet end with the portion of the passage of greatest diameter at the inlet end; .a thermostat located within the sphere oi' innuence of the water; a iai-metallic circuit breaker; an electric circuit including a source of current supply, said bi-metallic circuit breaker, said thermostat and said electrically controlled burner for controlling the action oi' said burner; a nozzle cleaner for the burner; and means for actuating said nozzle cleaner when the burner is rendered operative; said nomle cleaner comprising an electro-magnet coil, an armature core, a bushing in which said core is loosely guided, a cleaning needle carried by said core and projecting through the inlet end into said nozzle. said core and said needle being advanced when the coil is energized `and being returned by gravity when the coil is deenergized, the diameter of the needle being less than the least internal diameter ot said nozzle ma" CAPLISCH DANUSER.

FELIX DANUBER. 

